Noctilucent Clouds Above Helsinki. Finland. July 22, 2011

I am not 100% sure these are noctilucent clouds. If anyone knows better, please tell me. Noctilucent clouds are thought to be cosmic dust hitting the atmosphere and catching the sun. They are only seen in the higher latitudes.

I look for that ‘veil’ like quality, and electric blue color. As for the source, there are many suggestions, but cosmic dust / volcanic dust / rocket exhaust – whatever – they sure are pretty to look at.

These Noctilucent clouds are made of crystals of water ice and are the highest clouds in the Earth s atmosphere normally too faint to be seen. They are usually observed in the summer months at latitudes between 50 and 70 degrees north and south of the equator illuminated by sunlight from below the horizon.. These clouds hover high above the ground but the Sun in certain places can still reach them and make them glow when the earth below is in darkness..Noctilucent Clouds. Once a rare phenomenon it seems like now these high altitude clouds are showing at lower levels. Noctilucent clouds have been observed since the 1800s but more recently they ve brightened and have been observed more regularly.

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